       (b/transform widget-model-count (id :vars-lb))
       (id :vars-entries-lbl))
     ;; new ns selected in ns-lb =>
-    ;; dis/enable var-trace-btn
     (b/bind
       (b/selection (id :doc-tf))
       (b/transform

      (config! ns-lb-popup :items [(id :new-browser-action) :separator (id :copy-fqn-action) 
                                    (id :fqn-from-clipboard-action) (id :fqn-from-selection-action)
                                    (id :open-url-from-selection-action) :separator
                                    "Load" :separator 
                                    (id :ns-trace-btn-action) (id :ns-untrace-btn-action) 
                                    ;;:separator auto-refresh-browser-cb
                                    ])

              (when (var-traceable? vr)
                (if (var-traced? vr)
                  (do (clojure.tools.trace/untrace-var* vr)
                      (config! (id :var-trace-btn-action) :name "Trace Var"))
                  (do (clojure.tools.trace/trace-var* vr)
                      (config! (id :var-trace-btn-action) :name "Untrace Var")))
                (selection! (id :vars-lb) (selection (id :vars-lb)))))))))
    ;;
    ;; select item in vars-lb => set associated fqn in doc-tf
